When I use 'Shift+B' to Zoom in to box, doesn't work
I have no idea why this is happening but i can give you some ways that it MAY fix it. Blender uses a central orbiting camera movement, this means that if you have zoomed in too much, the camera will be at the origin of the orbital system. You can zoom out and in with your scroll wheel and you can also use 'SHIFT+CTRL+(- or +)'. Hope this helped, if it did not please reply as i will try my best to help you!